Why have mommy there if he’s in the military, 19-21 yo (state law), or just looks young.In this case, I’d ask the buyer to bring a parent or other responsible adult to vouch for the sale. My mom bought me my first handgun at 18 (with my money).
Working in gun shops I met plenty of people in the 18-? aged people not mentally sound enough to transfer a handgun or revolver, much else voting.And a bunch not mentally old enough.
A dealer can refuse a sale just like a private seller can refuse a sell based on anything really. A buyer isn’t obligated to buy either at the meet-up if they feel sketchy. I guess it really comes down to if you feel sketched out walk away.